Adjustable height gauge for installing electrical box



FIG. 1 is a top perspective view for an adjustable height gauge for installing electrical box showing my new design;

FIG. 2 is a back side view thereof;

FIG. 3 is a front side view thereof;

FIG. 4 is a left side view, the right side view being a mirror image thereof;

FIG. 5 is a top side view, and,

FIG. 6 is a bottom side view. 

CLAIM The ornamental design for an adjustable height gauge for installing electrical box, as shown and described. 